Continous unhandled interrupt 6 on James Molly PIC/timer ex.
Posted: Wed Jun 29, 2022 2:01 pm
I had quite a bit of of my own code working, now I'm getting (continuous) unhandled interrupt 6 on everything. I know this means invalid opcode, and I assume the reason is, that it keeps attempting to execute illegal code, which calls the interrupt handler, again and again. However, even when I simply want to go back to the beginning and look again at James Molly's code with no modifications, that also gives me unhandled interrupt 6 (!), on everything from the PIC and timer example, and up.
Obviously this is my own doing, somehow. I just can't figure it out. I did notice that my system updated bochs to 2.7.2, so I downgraded to 2.7.1, but I still have the same issue (I didn't expect this to work).
I'm hoping that someone with experience would have a good idea of what the problem is, I guess that's a long shot and I should just get better at debugging with bochs. I can single step through the continuous interrupts as they get received, but I don't really recognize the code that's being run, the whole this is just weird.
This is from single stepping when it just keeps throwing "unhandled interrupt 6":
Not that I expect anyone to go through the effort of downloading and running, but in case anyone is curious about what I mean by the "PIC and timer example", here it is:
http://www.jamesmolloy.co.uk/tutorial_h ... pit.tar.gz
Obviously this is my own doing, somehow. I just can't figure it out. I did notice that my system updated bochs to 2.7.2, so I downgraded to 2.7.1, but I still have the same issue (I didn't expect this to work).
I'm hoping that someone with experience would have a good idea of what the problem is, I guess that's a long shot and I should just get better at debugging with bochs. I can single step through the continuous interrupts as they get received, but I don't really recognize the code that's being run, the whole this is just weird.
This is from single stepping when it just keeps throwing "unhandled interrupt 6":
Code: Select all
(0) [0x00000010014d] 0008:000000000010014d (unk. ctxt): mov edx, dword ptr ds:[eax-3128] ; 8b90c8f3ffff
<bochs:327>
Next at t=545748683
(0) [0x000000100153] 0008:0000000000100153 (unk. ctxt): mov ecx, dword ptr ss:[ebp-8] ; 8b4df8
<bochs:328>
Next at t=545748684
(0) [0x000000100156] 0008:0000000000100156 (unk. ctxt): add ecx, 0x00000050 ; 83c150
<bochs:329>
Next at t=545748685
(0) [0x000000100159] 0008:0000000000100159 (unk. ctxt): add ecx, ecx ; 01c9
<bochs:330>
Next at t=545748686
(0) [0x00000010015b] 0008:000000000010015b (unk. ctxt): add edx, ecx ; 01ca
<bochs:331>
Next at t=545748687
(0) [0x00000010015d] 0008:000000000010015d (unk. ctxt): mov ecx, dword ptr ds:[eax-3128] ; 8b88c8f3ffff
<bochs:332>
Next at t=545748688
(0) [0x000000100163] 0008:0000000000100163 (unk. ctxt): mov ebx, dword ptr ss:[ebp-8] ; 8b5df8
<bochs:333>
Next at t=545748689
(0) [0x000000100166] 0008:0000000000100166 (unk. ctxt): add ebx, ebx ; 01db
<bochs:334>
Next at t=545748690
(0) [0x000000100168] 0008:0000000000100168 (unk. ctxt): add ecx, ebx ; 01d9
<bochs:335>
Next at t=545748691
(0) [0x00000010016a] 0008:000000000010016a (unk. ctxt): movzx edx, word ptr ds:[edx] ; 0fb712
<bochs:336>
Next at t=545748692
(0) [0x00000010016d] 0008:000000000010016d (unk. ctxt): mov word ptr ds:[ecx], dx ; 668911
Next at t=545748693
(0) [0x000000100170] 0008:0000000000100170 (unk. ctxt): add dword ptr ss:[ebp-8], 0x00000001 ; 8345f801
<bochs:338>
Next at t=545748694
(0) [0x000000100174] 0008:0000000000100174 (unk. ctxt): cmp dword ptr ss:[ebp-8], 0x0000077f ; 817df87f070000
<bochs:339>
Next at t=545748695
(0) [0x00000010017b] 0008:000000000010017b (unk. ctxt): jle .-48 (0x0010014d) ; 7ed0http://www.jamesmolloy.co.uk/tutorial_h ... pit.tar.gz
